Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de216c9dbfdd650…

MALICIOUS

PDF

69.4 KB Created: 2021-05-12 23:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 74ace43aab99acfccc7e5c2b1ae57c28 SHA-1: 4a707e4ee834632f57d28ec9c8f9ee6293abffe9 SHA-256: 2de216c9dbfdd650b2d6cf4d745f4729a91ac88d1ae3909d1b8968b8550cf5d9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam strategy. While no scripts were directly extracted, the presence of numerous external URLs suggests a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=portfolio+landscape+lighting+replacement+parts PDF link annotation
    • https://jukudedavat.weebly.com/uploads/1/3/0/9/130969580/wazana.pdfIn PDF document text
    • http://setifol.66ghz.com/jsc_result_2018_bd_marksheet.pdfIn PDF document text
    • http://wimesuzajomos.mypressonline.com/57816395138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480162/normal_5ffb781041184.pdfIn PDF document text
    • https://lisokafi.weebly.com/uploads/1/3/4/6/134694643/4140260.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/ejhFM1T/wikipedia_english_phonology.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/Jr99iee/mixeposem.pdfIn PDF document text
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/xilelevejukoza.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/xafawuluxezokaxu.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/2758430.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/0jaWjfJ/89336179755.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/jaI9ggg/pound_cake_recipes_with_sour_cream.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/hjbigcm/guide_for_stick_war_legacy_2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392463/normal_6035e4c44a8fb.pdfIn PDF document text
    • https://cdn.sqhk.co/kubarevopew/bq6jgS6/idle_hero_defense_hacked_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutademopewe.epizy.com/adt_safewatch_pro_3000_programming_manual.pdfIn PDF document text
    • http://vawazovuvisu.rf.gd/alif_novel_complete_download.pdfIn PDF document text
    • http://nakabamafirek.epizy.com/systematic_approach_to_taxation_by_girish_ahuja.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 5568 bytes
SHA-256: 67be3d965804d21c3ec29827369f3b7dcaf3b86647e70d1856c9650442f41434
font_01_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 9988 bytes
SHA-256: d2cbe9f8188255d71722012792ca21d331de53dfc08cb6c4b7a7925a7a54b490

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